When trying to set up my blog to be hosted in Heroku, I set up it so I can push int Github repo, then Heroku will pull the code and deploy it. Locally it seemed to work fine with Hexo’s server, so I was a bit surprised when my blog failed. Heroku logs have shown the following:

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2019-11-20T22:39:25.000000+00:00 app[api]: Build succeeded
2019-11-20T22:39:27.173507+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2019-11-20T22:39:27.241329+00:00 heroku[web.1]: Process exited with status 143
2019-11-20T22:39:29.990618+00:00 heroku[web.1]: Starting process with command `npm start`
2019-11-20T22:39:33.485877+00:00 heroku[web.1]: State changed from starting to crashed
2019-11-20T22:39:33.556555+00:00 heroku[web.1]: State changed from crashed to starting
2019-11-20T22:39:33.470506+00:00 heroku[web.1]: Process exited with status 1
2019-11-20T22:39:33.322139+00:00 app[web.1]: npm ERR! missing script: start

Apparently, Heroku tries to execute start script on Hexo website, so adding the following script to package.json solved this issue.

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"scripts": {
	"start": "hexo server -p $PORT"
	// the rest of the scripts
}